Comment by Timshel

Not necessarily, cf: https://lammotor.com/wp-content/uploads/2024/12/YASA-400R.jp...

From https://lammotor.com/yasa-axial-flux-motor/

the shape is due to the change to the motor layout: https://www.thedrive.com/news/why-axial-flux-motors-are-a-bi...